openssh_keypair and openssl_privatekey: add regenerate option (#67038)

* Add regenerate option to openssh_keypair and openssl_privatekey.

* Add changelog.

changelogs/fragments/67038-openssl-openssh-key-regenerate.yml

@@ -0,0 +1,3 @@
+minor_changes:
+- "openssh_keypair - the ``regenerate`` option allows to configure the module's behavior when it should or needs to regenerate private keys."
+- "openssl_privatekey - the ``regenerate`` option allows to configure the module's behavior when it should or needs to regenerate private keys."

lib/ansible/modules/crypto/openssh_keypair.py

@@ -63,6 +63,39 @@ options:
             - Provides a new comment to the public key. When checking if the key is in the correct state this will be ignored.
         type: str
         version_added: "2.9"
+    regenerate:
+        description:
+            - Allows to configure in which situations the module is allowed to regenerate private keys.
+              The module will always generate a new key if the destination file does not exist.
+            - By default, the key will be regenerated when it doesn't match the module's options,
+              except when the key cannot be read or the passphrase does not match. Please note that
+              this B(changed) for Ansible 2.10. For Ansible 2.9, the behavior was as if C(full_idempotence)
+              is specified.
+            - If set to C(never), the module will fail if the key cannot be read or the passphrase
+              isn't matching, and will never regenerate an existing key.
+            - If set to C(fail), the module will fail if the key does not correspond to the module's
+              options.
+            - If set to C(partial_idempotence), the key will be regenerated if it does not conform to
+              the module's options. The key is B(not) regenerated if it cannot be read (broken file),
+              the key is protected by an unknown passphrase, or when they key is not protected by a
+              passphrase, but a passphrase is specified.
+            - If set to C(full_idempotence), the key will be regenerated if it does not conform to the
+              module's options. This is also the case if the key cannot be read (broken file), the key
+              is protected by an unknown passphrase, or when they key is not protected by a passphrase,
+              but a passphrase is specified. Make sure you have a B(backup) when using this option!
+            - If set to C(always), the module will always regenerate the key. This is equivalent to
+              setting I(force) to C(yes).
+            - Note that adjusting the comment and the permissions can be changed without regeneration.
+              Therefore, even for C(never), the task can result in changed.
+        type: str
+        choices:
+            - never
+            - fail
+            - partial_idempotence
+            - full_idempotence
+            - always
+        default: partial_idempotence
+        version_added: '2.10'
 notes:
     - In case the ssh key is broken or password protected, the module will fail. Set the I(force) option to C(yes) if you want to regenerate the keypair.
 
@@ -149,6 +182,9 @@ class Keypair(object):
         self.privatekey = None
         self.fingerprint = {}
         self.public_key = {}
+        self.regenerate = module.params['regenerate']
+        if self.regenerate == 'always':
+            self.force = True
 
         if self.type in ('rsa', 'rsa1'):
             self.size = 4096 if self.size is None else self.size
@@ -236,13 +272,7 @@ class Keypair(object):
         if module.set_fs_attributes_if_different(file_args, False):
             self.changed = True
 
-    def isPrivateKeyValid(self, module, perms_required=True):
+    def _check_pass_protected_or_broken_key(self, module):
-
-        # check if the key is correct
-        def _check_state():
-            return os.path.exists(self.path)
-
-        def _check_pass_protected_or_broken_key():
         key_state = module.run_command([module.get_bin_path('ssh-keygen', True),
                                         '-P', '', '-yf', self.path], check_rc=False)
         if key_state[0] == 255 or 'is not a public key file' in key_state[2]:
@@ -251,27 +281,41 @@ class Keypair(object):
             return True
         return False
 
-        if _check_state():
+    def isPrivateKeyValid(self, module, perms_required=True):
-            if _check_pass_protected_or_broken_key():
+
+        # check if the key is correct
+        def _check_state():
+            return os.path.exists(self.path)
+
+        if not _check_state():
+            return False
+
+        if self._check_pass_protected_or_broken_key(module):
+            if self.regenerate in ('full_idempotence', 'always'):
+                return False
             module.fail_json(msg='Unable to read the key. The key is protected with a passphrase or broken.'
-                                     ' Will not proceed. To force regeneration, call the module with `force=yes`.')
+                                 ' Will not proceed. To force regeneration, call the module with `generate`'
+                                 ' set to `full_idempotence` or `always`, or with `force=yes`.')
 
         proc = module.run_command([module.get_bin_path('ssh-keygen', True), '-lf', self.path], check_rc=False)
         if not proc[0] == 0:
             if os.path.isdir(self.path):
                 module.fail_json(msg='%s is a directory. Please specify a path to a file.' % (self.path))
 
+            if self.regenerate in ('full_idempotence', 'always'):
                 return False
+            module.fail_json(msg='Unable to read the key. The key is protected with a passphrase or broken.'
+                                 ' Will not proceed. To force regeneration, call the module with `generate`'
+                                 ' set to `full_idempotence` or `always`, or with `force=yes`.')
 
         fingerprint = proc[1].split()
         keysize = int(fingerprint[0])
         keytype = fingerprint[-1][1:-1].lower()
-        else:
-            return False
 
-        def _check_perms(module):
+        self.fingerprint = fingerprint
-            file_args = module.load_file_common_arguments(module.params)
+
-            return not module.set_fs_attributes_if_different(file_args, False)
+        if self.regenerate == 'never':
+            return True
 
         def _check_type():
             return self.type == keytype
@@ -279,12 +323,18 @@ class Keypair(object):
         def _check_size():
             return self.size == keysize
 
-        self.fingerprint = fingerprint
+        if not (_check_type() and _check_size()):
+            if self.regenerate in ('partial_idempotence', 'full_idempotence', 'always'):
+                return False
+            module.fail_json(msg='Key has wrong type and/or size.'
+                                 ' Will not proceed. To force regeneration, call the module with `generate`'
+                                 ' set to `partial_idempotence`, `full_idempotence` or `always`, or with `force=yes`.')
 
-        if not perms_required:
+        def _check_perms(module):
-            return _check_state() and _check_type() and _check_size()
+            file_args = module.load_file_common_arguments(module.params)
+            return not module.set_fs_attributes_if_different(file_args, False)
 
-        return _check_state() and _check_perms(module) and _check_type() and _check_size()
+        return not perms_required or _check_perms(module)
 
     def isPublicKeyValid(self, module, perms_required=True):
 
@@ -299,11 +349,13 @@ class Keypair(object):
         def _parse_pubkey(pubkey_content):
             if pubkey_content:
                 parts = pubkey_content.split(' ', 2)
+                if len(parts) < 2:
+                    return False
                 return parts[0], parts[1], '' if len(parts) <= 2 else parts[2]
             return False
 
         def _pubkey_valid(pubkey):
-            if pubkey_parts:
+            if pubkey_parts and _parse_pubkey(pubkey):
                 return pubkey_parts[:2] == _parse_pubkey(pubkey)[:2]
             return False
 
@@ -317,19 +369,24 @@ class Keypair(object):
             file_args['path'] = file_args['path'] + '.pub'
             return not module.set_fs_attributes_if_different(file_args, False)
 
+        pubkey_parts = _parse_pubkey(_get_pubkey_content())
+
         pubkey = module.run_command([module.get_bin_path('ssh-keygen', True), '-yf', self.path])
         pubkey = pubkey[1].strip('\n')
-        pubkey_parts = _parse_pubkey(_get_pubkey_content())
         if _pubkey_valid(pubkey):
             self.public_key = pubkey
+        else:
+            return False
 
-        if not self.comment:
+        if self.comment:
-            return _pubkey_valid(pubkey)
+            if not _comment_valid():
+                return False
 
-        if not perms_required:
+        if perms_required:
-            return _pubkey_valid(pubkey) and _comment_valid()
+            if not _check_perms(module):
+                return False
 
-        return _pubkey_valid(pubkey) and _comment_valid() and _check_perms(module)
+        return True
 
     def dump(self):
         # return result as a dict
@@ -382,6 +439,11 @@ def main():
             force=dict(type='bool', default=False),
             path=dict(type='path', required=True),
             comment=dict(type='str'),
+            regenerate=dict(
+                type='str',
+                default='partial_idempotence',
+                choices=['never', 'fail', 'partial_idempotence', 'full_idempotence', 'always']
+            ),
         ),
         supports_check_mode=True,
         add_file_common_args=True,
@@ -401,7 +463,7 @@ def main():
 
         if module.check_mode:
             result = keypair.dump()
-            result['changed'] = module.params['force'] or not keypair.isPrivateKeyValid(module) or not keypair.isPublicKeyValid(module)
+            result['changed'] = keypair.force or not keypair.isPrivateKeyValid(module) or not keypair.isPublicKeyValid(module)
             module.exit_json(**result)
 
         try:

lib/ansible/modules/crypto/openssl_privatekey.py

@@ -164,6 +164,39 @@ options:
         type: bool
         default: no
         version_added: "2.10"
+    regenerate:
+        description:
+            - Allows to configure in which situations the module is allowed to regenerate private keys.
+              The module will always generate a new key if the destination file does not exist.
+            - By default, the key will be regenerated when it doesn't match the module's options,
+              except when the key cannot be read or the passphrase does not match. Please note that
+              this B(changed) for Ansible 2.10. For Ansible 2.9, the behavior was as if C(full_idempotence)
+              is specified.
+            - If set to C(never), the module will fail if the key cannot be read or the passphrase
+              isn't matching, and will never regenerate an existing key.
+            - If set to C(fail), the module will fail if the key does not correspond to the module's
+              options.
+            - If set to C(partial_idempotence), the key will be regenerated if it does not conform to
+              the module's options. The key is B(not) regenerated if it cannot be read (broken file),
+              the key is protected by an unknown passphrase, or when they key is not protected by a
+              passphrase, but a passphrase is specified.
+            - If set to C(full_idempotence), the key will be regenerated if it does not conform to the
+              module's options. This is also the case if the key cannot be read (broken file), the key
+              is protected by an unknown passphrase, or when they key is not protected by a passphrase,
+              but a passphrase is specified. Make sure you have a B(backup) when using this option!
+            - If set to C(always), the module will always regenerate the key. This is equivalent to
+              setting I(force) to C(yes).
+            - Note that if I(format_mismatch) is set to C(convert) and everything matches except the
+              format, the key will always be converted, except if I(regenerate) is set to C(always).
+        type: str
+        choices:
+            - never
+            - fail
+            - partial_idempotence
+            - full_idempotence
+            - always
+        default: full_idempotence
+        version_added: '2.10'
 extends_documentation_fragment:
 - files
 seealso:
@@ -321,6 +354,9 @@ class PrivateKeyBase(crypto_utils.OpenSSLObject):
         self.format_mismatch = module.params['format_mismatch']
         self.privatekey_bytes = None
         self.return_content = module.params['return_content']
+        self.regenerate = module.params['regenerate']
+        if self.regenerate == 'always':
+            self.force = True
 
         self.backup = module.params['backup']
         self.backup_file = None
@@ -333,6 +369,11 @@ class PrivateKeyBase(crypto_utils.OpenSSLObject):
         """(Re-)Generate private key."""
         pass
 
+    @abc.abstractmethod
+    def _ensure_private_key_loaded(self):
+        """Make sure that the private key has been loaded."""
+        pass
+
     @abc.abstractmethod
     def _get_private_key_data(self):
         """Return bytes for self.privatekey"""
@@ -359,6 +400,7 @@ class PrivateKeyBase(crypto_utils.OpenSSLObject):
             # Convert
             if self.backup:
                 self.backup_file = module.backup_local(self.path)
+            self._ensure_private_key_loaded()
             privatekey_data = self._get_private_key_data()
             if self.return_content:
                 self.privatekey_bytes = privatekey_data
@@ -390,19 +432,42 @@ class PrivateKeyBase(crypto_utils.OpenSSLObject):
     def check(self, module, perms_required=True, ignore_conversion=True):
         """Ensure the resource is in its desired state."""
 
-        state_and_perms = super(PrivateKeyBase, self).check(module, perms_required)
+        state_and_perms = super(PrivateKeyBase, self).check(module, perms_required=False)
 
-        if not state_and_perms or not self._check_passphrase():
+        if not state_and_perms:
+            # key does not exist
             return False
 
+        if not self._check_passphrase():
+            if self.regenerate in ('full_idempotence', 'always'):
+                return False
+            module.fail_json(msg='Unable to read the key. The key is protected with a another passphrase / no passphrase or broken.'
+                                 ' Will not proceed. To force regeneration, call the module with `generate`'
+                                 ' set to `full_idempotence` or `always`, or with `force=yes`.')
+
+        if self.regenerate != 'never':
             if not self._check_size_and_type():
+                if self.regenerate in ('partial_idempotence', 'full_idempotence', 'always'):
                     return False
+                module.fail_json(msg='Key has wrong type and/or size.'
+                                     ' Will not proceed. To force regeneration, call the module with `generate`'
+                                     ' set to `partial_idempotence`, `full_idempotence` or `always`, or with `force=yes`.')
 
         if not self._check_format():
-            if not ignore_conversion or self.format_mismatch != 'convert':
+            # During conversion step, convert if format does not match and format_mismatch == 'convert'
+            if not ignore_conversion and self.format_mismatch == 'convert':
                 return False
+            # During generation step, regenerate if format does not match and format_mismatch == 'regenerate'
+            if ignore_conversion and self.format_mismatch == 'regenerate' and self.regenerate != 'never':
+                if not ignore_conversion or self.regenerate in ('partial_idempotence', 'full_idempotence', 'always'):
+                    return False
+                module.fail_json(msg='Key has wrong format.'
+                                     ' Will not proceed. To force regeneration, call the module with `generate`'
+                                     ' set to `partial_idempotence`, `full_idempotence` or `always`, or with `force=yes`.'
+                                     ' To convert the key, set `format_mismatch` to `convert`.')
 
-        return True
+        # check whether permissions are correct (in case that needs to be checked)
+        return not perms_required or super(PrivateKeyBase, self).check(module, perms_required=perms_required)
 
     def dump(self):
         """Serialize the object into a dictionary."""
@@ -453,6 +518,14 @@ class PrivateKeyPyOpenSSL(PrivateKeyBase):
         except (TypeError, ValueError) as exc:
             raise PrivateKeyError(exc)
 
+    def _ensure_private_key_loaded(self):
+        """Make sure that the private key has been loaded."""
+        if self.privatekey is None:
+            try:
+                self.privatekey = privatekey = crypto_utils.load_privatekey(self.path, self.passphrase)
+            except crypto_utils.OpenSSLBadPassphraseError as exc:
+                raise PrivateKeyError(exc)
+
     def _get_private_key_data(self):
         """Return bytes for self.privatekey"""
         if self.cipher and self.passphrase:
@@ -478,12 +551,8 @@ class PrivateKeyPyOpenSSL(PrivateKeyBase):
         def _check_type(privatekey):
             return self.type == privatekey.type()
 
-        try:
+        self._ensure_private_key_loaded()
-            privatekey = crypto_utils.load_privatekey(self.path, self.passphrase)
+        return _check_size(self.privatekey) and _check_type(self.privatekey)
-        except crypto_utils.OpenSSLBadPassphraseError as exc:
-            raise PrivateKeyError(exc)
-
-        return _check_size(privatekey) and _check_type(privatekey)
 
     def _check_format(self):
         # Not supported by this backend
@@ -606,6 +675,11 @@ class PrivateKeyCryptography(PrivateKeyBase):
         except cryptography.exceptions.UnsupportedAlgorithm as dummy:
             self.module.fail_json(msg='Cryptography backend does not support the algorithm required for {0}'.format(self.type))
 
+    def _ensure_private_key_loaded(self):
+        """Make sure that the private key has been loaded."""
+        if self.privatekey is None:
+            self.privatekey = self._load_privatekey()
+
     def _get_private_key_data(self):
         """Return bytes for self.privatekey"""
         # Select export format and encoding
@@ -697,7 +771,11 @@ class PrivateKeyCryptography(PrivateKeyBase):
                 data = f.read()
             format = crypto_utils.identify_private_key_format(data)
             if format == 'raw':
-                # Raw keys cannot be encrypted
+                # Raw keys cannot be encrypted. To avoid incompatibilities, we try to
+                # actually load the key (and return False when this fails).
+                self._load_privatekey()
+                # Loading the key succeeded. Only return True when no passphrase was
+                # provided.
                 return self.passphrase is None
             else:
                 return cryptography.hazmat.primitives.serialization.load_pem_private_key(
@@ -709,27 +787,26 @@ class PrivateKeyCryptography(PrivateKeyBase):
             return False
 
     def _check_size_and_type(self):
-        privatekey = self._load_privatekey()
+        self._ensure_private_key_loaded()
-        self.privatekey = privatekey
 
-        if isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey):
+        if isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey):
-            return self.type == 'RSA' and self.size == privatekey.key_size
+            return self.type == 'RSA' and self.size == self.privatekey.key_size
-        if isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey):
+        if isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.dsa.DSAPrivateKey):
-            return self.type == 'DSA' and self.size == privatekey.key_size
+            return self.type == 'DSA' and self.size == self.privatekey.key_size
-        if CRYPTOGRAPHY_HAS_X25519 and isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.x25519.X25519PrivateKey):
+        if CRYPTOGRAPHY_HAS_X25519 and isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.x25519.X25519PrivateKey):
             return self.type == 'X25519'
-        if CRYPTOGRAPHY_HAS_X448 and isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.x448.X448PrivateKey):
+        if CRYPTOGRAPHY_HAS_X448 and isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.x448.X448PrivateKey):
             return self.type == 'X448'
-        if CRYPTOGRAPHY_HAS_ED25519 and isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PrivateKey):
+        if CRYPTOGRAPHY_HAS_ED25519 and isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PrivateKey):
             return self.type == 'Ed25519'
-        if CRYPTOGRAPHY_HAS_ED448 and isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.ed448.Ed448PrivateKey):
+        if CRYPTOGRAPHY_HAS_ED448 and isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.ed448.Ed448PrivateKey):
             return self.type == 'Ed448'
-        if isinstance(privatekey, cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey):
+        if isinstance(self.privatekey, cryptography.hazmat.primitives.asymmetric.ec.EllipticCurvePrivateKey):
             if self.type != 'ECC':
                 return False
             if self.curve not in self.curves:
                 return False
-            return self.curves[self.curve]['verify'](privatekey)
+            return self.curves[self.curve]['verify'](self.privatekey)
 
         return False
 
@@ -777,6 +854,11 @@ def main():
             format_mismatch=dict(type='str', default='regenerate', choices=['regenerate', 'convert']),
             select_crypto_backend=dict(type='str', choices=['auto', 'pyopenssl', 'cryptography'], default='auto'),
             return_content=dict(type='bool', default=False),
+            regenerate=dict(
+                type='str',
+                default='full_idempotence',
+                choices=['never', 'fail', 'partial_idempotence', 'full_idempotence', 'always']
+            ),
         ),
         supports_check_mode=True,
         add_file_common_args=True,
@@ -837,7 +919,9 @@ def main():
         if private_key.state == 'present':
             if module.check_mode:
                 result = private_key.dump()
-                result['changed'] = module.params['force'] or not private_key.check(module)
+                result['changed'] = private_key.force \
+                    or not private_key.check(module, ignore_conversion=True) \
+                    or not private_key.check(module, ignore_conversion=False)
                 module.exit_json(**result)
 
             private_key.generate(module)

test/integration/targets/openssh_keypair/tasks/main.yml

@@ -109,3 +109,267 @@
   register: privatekey8_result_force
 
 - import_tasks: ../tests/validate.yml
+
+
+# Test regenerate option
+
+- name: Regenerate - setup simple keys
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: rsa
+    size: 1024
+  loop: "{{ regenerate_values }}"
+- name: Regenerate - setup password protected keys
+  command: 'ssh-keygen -f {{ output_dir }}/regenerate-b-{{ item }} -N password'
+  loop: "{{ regenerate_values }}"
+- name: Regenerate - setup broken keys
+  copy:
+    dest: '{{ output_dir }}/regenerate-c-{{ item.0 }}{{ item.1 }}'
+    content: 'broken key'
+    mode: '0700'
+  with_nested:
+    - "{{ regenerate_values }}"
+    - [ '', '.pub' ]
+
+- name: Regenerate - modify broken keys (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-c-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify broken keys
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-c-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify password protected keys (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-b-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify password protected keys
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-b-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - not modify regular keys (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  register: result
+- assert:
+    that:
+      - result.results[0] is not changed
+      - result.results[1] is not changed
+      - result.results[2] is not changed
+      - result.results[3] is not changed
+      - result.results[4] is changed
+
+- name: Regenerate - not modify regular keys
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: rsa
+    size: 1024
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  register: result
+- assert:
+    that:
+      - result.results[0] is not changed
+      - result.results[1] is not changed
+      - result.results[2] is not changed
+      - result.results[3] is not changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key size (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: rsa
+    size: 1048
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key size
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: rsa
+    size: 1048
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - redistribute keys
+  copy:
+    src: '{{ output_dir }}/regenerate-a-always{{ item.1 }}'
+    dest: '{{ output_dir }}/regenerate-a-{{ item.0 }}{{ item.1 }}'
+    remote_src: true
+  with_nested:
+    - "{{ regenerate_values }}"
+    - [ '', '.pub' ]
+  when: "item.0 != 'always'"
+
+- name: Regenerate - adjust key type (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: dsa
+    size: 1024
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key type
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: dsa
+    size: 1024
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - redistribute keys
+  copy:
+    src: '{{ output_dir }}/regenerate-a-always{{ item.1 }}'
+    dest: '{{ output_dir }}/regenerate-a-{{ item.0 }}{{ item.1 }}'
+    remote_src: true
+  with_nested:
+    - "{{ regenerate_values }}"
+    - [ '', '.pub' ]
+  when: "item.0 != 'always'"
+
+- name: Regenerate - adjust comment (check mode)
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: dsa
+    size: 1024
+    comment: test comment
+    regenerate: '{{ item }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result is changed
+
+- name: Regenerate - adjust comment
+  openssh_keypair:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}'
+    type: dsa
+    size: 1024
+    comment: test comment
+    regenerate: '{{ item }}'
+  loop: "{{ regenerate_values }}"
+  register: result
+- assert:
+    that:
+      - result is changed
+      # for all values but 'always', the key should have not been regenerated.
+      # verify this by comparing fingerprints:
+      - result.results[0].fingerprint == result.results[1].fingerprint
+      - result.results[0].fingerprint == result.results[2].fingerprint
+      - result.results[0].fingerprint == result.results[3].fingerprint
+      - result.results[0].fingerprint != result.results[4].fingerprint

test/integration/targets/openssh_keypair/vars/main.yml

@@ -0,0 +1,7 @@
+---
+regenerate_values:
+  - never
+  - fail
+  - partial_idempotence
+  - full_idempotence
+  - always

test/integration/targets/openssl_privatekey/tasks/impl.yml

@@ -465,3 +465,341 @@
         - privatekey_fmt_2_step_6.privatekey == lookup('file', output_dir ~ '/privatekey_fmt_2.pem', rstrip=False)
 
   when: 'select_crypto_backend == "cryptography" and cryptography_version.stdout is version("2.6", ">=")'
+
+
+
+# Test regenerate option
+
+- name: Regenerate - setup simple keys
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+- name: Regenerate - setup password protected keys
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-b-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    passphrase: hunter2
+    cipher: "{{ 'aes256' if select_crypto_backend == 'pyopenssl' else 'auto' }}"
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+- name: Regenerate - setup broken keys
+  copy:
+    dest: '{{ output_dir }}/regenerate-c-{{ item }}.pem'
+    content: 'broken key'
+    mode: '0700'
+  loop: "{{ regenerate_values }}"
+
+- name: Regenerate - modify broken keys (check mode)
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-c-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[0].msg or 'Cannot load raw key' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[1].msg or 'Cannot load raw key' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[2].msg or 'Cannot load raw key' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify broken keys
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-c-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[0].msg or 'Cannot load raw key' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[1].msg or 'Cannot load raw key' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[2].msg or 'Cannot load raw key' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify password protected keys (check mode)
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-b-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - modify password protected keys
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-b-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[0].msg"
+      - result.results[1] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is failed
+      - "'Unable to read the key. The key is protected with a another passphrase / no passphrase or broken. Will not proceed.' in result.results[2].msg"
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - not modify regular keys (check mode)
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  register: result
+- assert:
+    that:
+      - result.results[0] is not changed
+      - result.results[1] is not changed
+      - result.results[2] is not changed
+      - result.results[3] is not changed
+      - result.results[4] is changed
+
+- name: Regenerate - not modify regular keys
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: RSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+  register: result
+- assert:
+    that:
+      - result.results[0] is not changed
+      - result.results[1] is not changed
+      - result.results[2] is not changed
+      - result.results[3] is not changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key size (check mode)
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: RSA
+    size: 1048
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key size
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: RSA
+    size: 1048
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - redistribute keys
+  copy:
+    src: '{{ output_dir }}/regenerate-a-always.pem'
+    dest: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    remote_src: true
+  loop: "{{ regenerate_values }}"
+  when: "item != 'always'"
+
+- name: Regenerate - adjust key type (check mode)
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: DSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  check_mode: yes
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- name: Regenerate - adjust key type
+  openssl_privatekey:
+    path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+    type: DSA
+    size: 1024
+    regenerate: '{{ item }}'
+    select_crypto_backend: '{{ select_crypto_backend }}'
+  loop: "{{ regenerate_values }}"
+  ignore_errors: yes
+  register: result
+- assert:
+    that:
+      - result.results[0] is success and result.results[0] is not changed
+      - result.results[1] is failed
+      - "'Key has wrong type and/or size. Will not proceed.' in result.results[1].msg"
+      - result.results[2] is changed
+      - result.results[3] is changed
+      - result.results[4] is changed
+
+- block:
+  - name: Regenerate - redistribute keys
+    copy:
+      src: '{{ output_dir }}/regenerate-a-always.pem'
+      dest: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      remote_src: true
+    loop: "{{ regenerate_values }}"
+    when: "item != 'always'"
+
+  - name: Regenerate - format mismatch (check mode)
+    openssl_privatekey:
+      path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      type: DSA
+      size: 1024
+      format: pkcs8
+      regenerate: '{{ item }}'
+      select_crypto_backend: '{{ select_crypto_backend }}'
+    check_mode: yes
+    loop: "{{ regenerate_values }}"
+    ignore_errors: yes
+    register: result
+  - assert:
+      that:
+        - result.results[0] is success and result.results[0] is not changed
+        - result.results[1] is failed
+        - "'Key has wrong format. Will not proceed.' in result.results[1].msg"
+        - result.results[2] is changed
+        - result.results[3] is changed
+        - result.results[4] is changed
+
+  - name: Regenerate - format mismatch
+    openssl_privatekey:
+      path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      type: DSA
+      size: 1024
+      format: pkcs8
+      regenerate: '{{ item }}'
+      select_crypto_backend: '{{ select_crypto_backend }}'
+    loop: "{{ regenerate_values }}"
+    ignore_errors: yes
+    register: result
+  - assert:
+      that:
+        - result.results[0] is success and result.results[0] is not changed
+        - result.results[1] is failed
+        - "'Key has wrong format. Will not proceed.' in result.results[1].msg"
+        - result.results[2] is changed
+        - result.results[3] is changed
+        - result.results[4] is changed
+
+  - name: Regenerate - redistribute keys
+    copy:
+      src: '{{ output_dir }}/regenerate-a-always.pem'
+      dest: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      remote_src: true
+    loop: "{{ regenerate_values }}"
+    when: "item != 'always'"
+
+  - name: Regenerate - convert format (check mode)
+    openssl_privatekey:
+      path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      type: DSA
+      size: 1024
+      format: pkcs1
+      format_mismatch: convert
+      regenerate: '{{ item }}'
+      select_crypto_backend: '{{ select_crypto_backend }}'
+    check_mode: yes
+    loop: "{{ regenerate_values }}"
+    register: result
+  - assert:
+      that:
+        - result.results[0] is changed
+        - result.results[1] is changed
+        - result.results[2] is changed
+        - result.results[3] is changed
+        - result.results[4] is changed
+
+  - name: Regenerate - convert format
+    openssl_privatekey:
+      path: '{{ output_dir }}/regenerate-a-{{ item }}.pem'
+      type: DSA
+      size: 1024
+      format: pkcs1
+      format_mismatch: convert
+      regenerate: '{{ item }}'
+      select_crypto_backend: '{{ select_crypto_backend }}'
+    loop: "{{ regenerate_values }}"
+    register: result
+  - assert:
+      that:
+        - result.results[0] is changed
+        - result.results[1] is changed
+        - result.results[2] is changed
+        - result.results[3] is changed
+        - result.results[4] is changed
+        # for all values but 'always', the key should have not been regenerated.
+        # verify this by comparing fingerprints:
+        - result.results[0].fingerprint == result.results[1].fingerprint
+        - result.results[0].fingerprint == result.results[2].fingerprint
+        - result.results[0].fingerprint == result.results[3].fingerprint
+        - result.results[0].fingerprint != result.results[4].fingerprint
+  when: 'select_crypto_backend == "cryptography" and cryptography_version.stdout is version("2.6", ">=")'

test/integration/targets/openssl_privatekey/vars/main.yml

@@ -0,0 +1,7 @@
+---
+regenerate_values:
+  - never
+  - fail
+  - partial_idempotence
+  - full_idempotence
+  - always